| experimental exposure of adult san marcos salamanders and larval leopard frogs to the cercariae of centrocestus formosanus. | the gill parasite centrocestus formosanus (trematoda: heterophyidae) is an exotic parasite of concern in texas because it has been shown to infect multiple threatened and endangered fish species. the purpose of this study was to determine if c. formosanus could present a threat to larval anurans, as well as threatened neotenic salamanders endemic to the spring-fed systems of texas. we exposed adults of the san marcos salamander eurycea nana (caudata: plethodontidae) and tadpoles of the rio grand ... | 2014 | 24303882 |
| behavioral and physiological antipredator responses of the san marcos salamander, eurycea nana. | exposure to predatory stimuli typically results in the elevation of circulating glucocorticoid levels and a behavioral response of freezing or escape behavior in many prey species. corticosterone (cort) is the main glucocorticoid in amphibians and is known to be important in modulating many behaviors and developmental functions. the federally threatened san marcos salamander, eurycea nana, decreases activity in response to both native and introduced predatory fish, however, experience may furthe ... | 2015 | 25446225 |
| evolving possibilities: post-embryonic axial elongation in salamanders with biphasic (eurcyea cirrigera, e. longicauda, e. quadridigitata) and paedomorphic life cycles (eurycea nana and ambystoma mexicanum). submitted acta zoologica. | typically the number of vertebrae an organism will have post-embryonically is determined during embryogenesis via the development of paired somites. our research investigates the phenomenon of post-embryonic vertebral addition in salamander tails. we describe body and tail growth, and patterns of postsacral vertebral addition and elongation in context with caudal morphology for four plethodontids (eurycea), and one ambystomatid. eurycea nana and a. mexicanum have paedomorphic life cycles; e. cir ... | 2012 | 24790225 |
| three new helminth species from two endemic plethodontid salamanders, typhlomolge rathbuni and eurycea nana, in central texas. | helminthological examination of two rare, endemic species of plethodontid salamanders, the texas blind salamander (typhlomolge rathbuni stejneger) and the san marcos dwarf salamander (eurycea nana bishop), from the subterranean waters and springs in san marcos, hays county, central texas, usa revealed the presence of three new, previously undescribed species of intestinal helminths: brachycoelium longleyi sp. n. (trematoda) from t. rathbuni (type host) and e. nana, dendronucleata americana sp. n ... | 2000 | 11104146 |
| a vavraia-like microsporidium as the cause of deadly infection in threatened and endangered eurycea salamanders in the united states. | eurycea sosorum (barton springs salamander) and eurycea nana (san macros salamander) are listed as endangered and threatened species, respectively, by the u.s. fish and wildlife service (usfws) with habitats restricted to small regions near austin, texas, usa. the conservation efforts with the eurycea salamanders at the captive breeding program in san marcos aquatic resources center (smarc), a usfws facility, have seen an unexpected and increased mortality rate over the past few years. the clini ... | 2019 | 30871588 |